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QA of CBCT
•
Alignment of kV and MV lines
–
verify isocenter 3D agreement
–
verify registration and alignment process
•
Image quality
–
monitor image quality parameters
–
watch for degradation
•
Patient dose
–
measure base value (surrogates: air dose, HVL)
–
monitor changes
Penta Guide
Catphan
Recommended reading:
Commissioning experience with cone beam
computed tomography for image-guided
radiation therapy
Lehmann et al. Journal of applied clinical
physics 2007
Clinical use of electronic portal imaging:
Report of AAPM Radiation
Therapy Committee Task Group 58
AAPM Medical Physics Practice Guideline
2.a: Commissioning and quality assurance
of X-ray–based image-guided radiotherapy
systems